"Best party ever, whoo!" Perry was inspired to write Last Friday Night after a wild night of partying and streaking in the park. It tells the story of a nerdy teenager who wakes up after a party at her house, and can’t remember any of the debauchery from the night before. Another smash hit for Perry, it made her the first female artist to ever have 5 singles at number 1 in the Billboard hot 100.